Use the hostapd_test_utils helper methods in am: c6cacf6149 am: b2d1a3b4c7

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24589850

Change-Id: I941d1bc469fd6f72a72c672dd5a37794abd5dab3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>